Status of Use Document: Draft
Alternate Names/Similar Uses: Clash Detection, 3D MEP Coordination, Conflict Identification, Interference Check, etc.
Phase(s): Construction / Design
Objective:
To coordinate the design and installation of building systems with each other and the rest of the the trades such as MEP, structural steel, concrete, drywall and all the trades inside the building. A few results of 3D coordination are: less conflicts, less delays in construction, less rework, less site supervision, less administrative burden, less
Example of Clash Detction in Navisworks
conflict between contractors. (Khanzode, 2008)
Description:
A process in which Clash Detection software is utilized during the coordination process to determine field conflicts by comparing 3D models of building systems. The goal of clash detection is to eliminate the major system conflicts prior to installation.
"use of automated clash detection programs that allow project teams to superimpose the models and check for conflicts in three-dimensional space to improve the MEP [design coordination] coordination process. "(Khanzode, 2008)
Note: This is not strictly 3D MEP coordination. The coordination process involves the entire design.
Reduces/Eliminates field conflicts; which reduces RFI's significantly compared to other methods (Khanzode, 2008)
Visualization - Foreman can see an area before it is placed in the field
Less rework (Staub-French, 2007)
Increased productivity (Staub-French, 2007))
Reduced construction cost; less cost growth due to design coordination (Staub-French, 2007)) i.e. change orders
Decrease in construction time (Staub-French, 2007))
Increased productivity on site (Staub-French, 2007))
Ability to build the system with a less skilled labor force (Staub-French, 2007))
Ability to prefabricate off-site leading to a safer and cleaner site (Khanzode, 2008)
More accurate as built drawings (Khanzode, 2008)
Increase marketability
Levels of Detail Considerations:
Extent of the existing facility and environment that you wish to model, e.g., modeling the exterior enclosure of the buildings, modeling all the interior spaces, modeling the detailed MEP systems
Extent to which the model will represent the final space (are shapes and size important or are actual building systems required)
Extent that the model will be develop by the architect, structural, and MEP engineer.
Level of detail needs to be determined by entire team. All contractors need to model the same level of detail in order for coordination to be most successful.
To model underground utilities or above-ceiling or both.
Minimum level of detail required for MEP coordination from Khanzode et al (Khanzode, 2008).
Architectural elements like interior walls and ceiling
Structural elements like the main structural framing, slabs, and foundations
Mechanical systems like duct work, etc.
Plumbing systems like the gravity lines and hot and cold water piping
Electrical systems like the major conduits and cable trays
Fire protection systems with the mains and branches
Other specialty systems like medical gases depending on the project
Point in Construction Process when Coordination Should be Implemented:
While the benefits of 3D coordination can be great when implemented during the construction phase of a building.
The coordination process will be simplified if coordination begins during the design phase.
It is recommended that the coordination process begins as soon as all the parties are selected. The selection of parties/contractors should occur during the design process.
Planning needs to take place early
Be prepared to spend more time during early coordination process than typical 2D coordination
Team Competencies Required:
Ability to deal with people and project challenges
Technical Knowledge of software
Ablity to learn software without formal instruction is helpful
3D Model manipulation
BIM model application knowledge for facility updates
Knowledge of building systems.
Characteristics in order to substantiate BIM use:
Suggested based on interviews and research that 3D Clash Detection show be completed new building projects. So would suggest that the subcontractor construct a model even if one is not supplied by architect/designer
Project -
Based on interviews all project projects should be coordinated.
It is more critical to coordinate heavy mechanical project with especailly heavily congested areas like mechanical rooms.
However it may be simpler to have establish standards for 3D design coordination a simpler mechanical project.
Organization - Any type of organization
Environment - All environments
Contract - Integrated Project Delivery and Design-Build project type make the process easier however it can be delievered with any contract type.
Process -
Coordinate drawing on a weekly basis to ensure that coordination meetings do not take too long. (possibly tuesday or wednesday)
Use Thursday thru Monday morning to update models.
The models should be brought together the day before the coordination meeting.
The Seems like complexity, size, limited plenum area, etc. would be important characteristics which impact whether you will use BIM for coordination with all trades.
Potential Modeling Methods:
Design Model
Recieved from Design Team
Modeled by subcontractors responsible - convert from 3D Shop Drawings
Modeled by 3rd Party
Trade Models
Modeled by subcontractors responsible - convert from 3D Shop Drawings
Modeled by 3rd Party
Note: it will most likely be a combination of all the above. It will be come necessary to determine to what level each party is responsible for modeling the project.
Potential Outputs:
3D coordination model (define file format)
2D drawings for signature
Drawing for digital fabrication
Prelimentary 3D as-builts
Legal / Commitment Considerations:
Guarantee of accuracy may be a significant concern, particularly if there are small tolerances for future object installations
Goal: 3D Design Coordination (Construction)
Alternate Names/Similar Uses: Clash Detection, 3D MEP Coordination, Conflict Identification, Interference Check, etc.
Phase(s): Construction / Design
Objective:
To coordinate the design and installation of building systems with each other and the rest of the the trades such as MEP, structural steel, concrete, drywall and all the trades inside the building. A few results of 3D coordination are: less conflicts, less delays in construction, less rework, less site supervision, less administrative burden, lessDescription:
A process in which Clash Detection software is utilized during the coordination process to determine field conflicts by comparing 3D models of building systems. The goal of clash detection is to eliminate the major system conflicts prior to installation."use of automated clash detection programs that allow project teams to superimpose the models and check for conflicts in three-dimensional space to improve the MEP [design coordination] coordination process. "(Khanzode, 2008)
Note: This is not strictly 3D MEP coordination. The coordination process involves the entire design.
Table of Contents
Potential Benefits:
Levels of Detail Considerations:
Point in Construction Process when Coordination Should be Implemented:
Team Competencies Required:
Characteristics in order to substantiate BIM use:
Suggested based on interviews and research that 3D Clash Detection show be completed new building projects. So would suggest that the subcontractor construct a model even if one is not supplied by architect/designerProject -
Organization - Any type of organization
Environment - All environments
Contract - Integrated Project Delivery and Design-Build project type make the process easier however it can be delievered with any contract type.
Process -
The Seems like complexity, size, limited plenum area, etc. would be important characteristics which impact whether you will use BIM for coordination with all trades.
Potential Modeling Methods:
Design Model
Trade Models
Note: it will most likely be a combination of all the above. It will be come necessary to determine to what level each party is responsible for modeling the project.
Potential Outputs:
Legal / Commitment Considerations:
Additional Resources:
General Description:
Quantitative Studies:
Case Study Examples:
Software Applications (AECBytes.com)(Khanzode, 2008):
References: